JP2005133943A - Screw thread joining device to join together ends with flare of two pipes - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screw thread joining device capable of simply joining together two pipe end parts and preventing undesired rotation of a pipe end part or suppressing it to a minimum during interjoining of the screw threads. <P>SOLUTION: In the screw thread joining device for interjoining the flare end parts 1 and 2 of two pipes, a spacer element 7 is provided at a first end part with a first certain fitting recessed part 8 to contain the end parts of the first pipe with the flares of the end parts 1 and 2 of a first pipe fitted in each other, and at a second end part with a second certain fitting recessed part 9 for containing the end parts of the other pipe with the flares of the end parts of the other pipe fitted in each other. Further, a certain fitting element is designed such that a nut 3 to contain the one pipe end part is provided and a spacer element 7 is inserted in the nut 3 in a joined state so that the flare of a pipe end contained in the nut is engaged with the certain fitting recessed parts 8 and 9 related to the spacer element 7, and the pipe end parts are fixed in a manner not to be rotated relatively with the nut. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a screw joining device for joining flared ends of two pipes. The term “screw joining device” comprises the device elements necessary to join the ends of two pipes. In particular, the present invention relates to the threaded connection of pipes used in the field of hydraulic devices or used as brake lines in motor vehicles.

  In actual use, threaded joining of two pipes is known. In this screw joint, the end of one pipe has a so-called E-flare, and the end of the other pipe has an F-flare complementary to the E-flare. Both the E-flare and the F-flare are defined by DIN 74234, for example. In known threaded joints, both pipe flares are pressed against each other with a fairly high contact pressure by means of a threaded joint using nuts and associated screws. Its purpose is to achieve a tight junction at the end of the pipe or a junction that does not leak even at high pressures. However, this screw connection, known from the state of the art, has several undesirable drawbacks. When an E-flare is formed at one end of the pipe, at least a part of the end of the pipe undergoes a plastic deformation relatively large. The solidification as a result of cold deformation has an adverse effect on the life of the formed joint. Such an adverse effect occurs, for example, when exposed to vibrations, especially when a mechanical load is applied to the screw joint. Furthermore, at the end of the screwing process, one or both of the pipe ends are rotated when screw joining is achieved. Often, the pipe ends produce undesired rotation relative to the threaded connection. Such a structure causes twisting of the pipe because the pipe is generally fixed at its end opposite the threaded joint. Such twisting of the pipe exerts a torque on the threaded joint, which loosens the threaded joint. For this reason, in practical applications, screw joints or screw joint devices are tightened beyond that limit. At the time of screw joining, if the pipe rotates relatively, damage to the sealing surface occurs as a result of the mutual friction of the two pipe flares. As will be appreciated, this is a disadvantage. In short, there is room for improvement in known screw joints.

  Therefore, the object of the present invention is to allow easy joining of two pipe ends, no leakage for a long time or under high pressure, avoiding the above-mentioned drawbacks, It is to provide a threaded joint or threaded joint of the kind mentioned at the outset, in which the desired rotation is prevented or minimized.

The purpose of this is in a screw joining device for joining the flare ends of two pipes,
A spacer element is provided, the spacer element having a first positive engagement recess for fitting and receiving a flare at the end of the (first) pipe at the first end, and a second end A second positively fitting recess for fitting and accommodating the flare at the end of the other (second) pipe in the part,
Further, a nut is provided for receiving one pipe end, and in a joined state, the spacer element such that the flare of the pipe end received by the nut engages the associated positive engagement recess of the spacer element. Is inserted into the nut,
In addition, a screw is provided for joining the other pipe ends so that, in the joined state, the pipe end flare accommodated by the screws engages the associated positive engagement recess of the spacer element. The associated pipe end is screwed into the nut,
Secure fit so that the nut and the pipe flare at the end of the pipe that is received in the joint are provided with a positive fit element and the associated pipe end is secured against rotation relative to the nut. This is achieved by designing the elements.

  The term “joined state” is the state when a screw joint between two flare pipe ends has been achieved. The present invention relates to a screw joining device comprising a nut, a screw and a spacer element, or the present invention relates to a screw joining device comprising substantially a nut, a screw and a spacer element. However, the invention extends to a screw joint unit consisting of two pipe ends to be joined with a nut, a screw and a spacer element.

  According to a first preferred embodiment of the invention, the nut is provided with a positively fitting element on the inside, and the pipe flare at the end of the pipe housed in the nut in the joined state is provided with a complementary positively fitting element. In this state, the positive fitting element inside the nut is engaged with the complementary positive fitting element of the pipe flare. Thereby, the accommodated pipe end is fixed so as not to rotate relative to the nut. In one embodiment, the positive fit element is a notch provided in the nut, which is preferably radially aligned. In this arrangement, the pipe flare's complementary positive mating elements are formed as corresponding protrusions that can be engaged to fit into the notches in the nut. In other embodiments, the complementary positive mating element of the pipe flare is formed as a notch, and the positive mating element of the nut is preferably a protrusion or engageable with the notch of the pipe flare so that it can be mated It has the shape of a web. According to the present invention, the depth of the notch and the height of the protrusion or web are selected such that the end of the pipe accommodated when fitting is not rotated relative to the nut.

  In another preferred embodiment of the invention, only the nut is provided with an inner positive mating element, and when this positive mating element achieves a threaded joint, a pipe flare at the end of the pipe that is accommodated in the nut in the joined state The inner positive mating element is designed to interrupt and thereby form a complementary positive mating element in the pipe flare. In this embodiment, the pipe flare does not have a complementary positive mating element at the start, but instead, when the threaded connection is effected by the action of the positive mating element on the pipe flare, these complementary A positive and positive fitting element is formed by a suitable pressing action. The positive mating element of the nut is preferably a protrusion or web that can be inserted into the pipe flare. Within the scope of the present invention, pipe flare materials are selected so that such interruption to the pipe flare and the formation of a complementary positive fit element can be easily achieved.

  Within the scope of the present invention, the spacer element is the spacer element to be sealed. In other words, each positively fitting recess of the spacer element comprises a sealing surface that is supported on the complementary sealing surface of the associated pipe flare. Further, within the scope of the present invention, a nut female screw is provided, and the screw is provided with a complementary male screw that engages with the female screw of the nut in a joined state. The nut houses the first pipe end. This pipe end is already accommodated in the nut when the screw is still inserted into the nut. When the screw is inserted into the nut with the second pipe end received, the nut surrounds the second pipe end received in the screw.

  In accordance with a preferred embodiment which is very important within the scope of the invention, at least one positively fitting recess, preferably both positively fitting recesses, of the spacer element are fitted to accommodate the associated pipe end flare. Designed, the flare is provided with a conical flange surface on the outside of the pipe, and the associated cone is tapered towards the end face of the pipe end. The positively fitting recess of the spacer element is provided with a complementary conical flange surface on the inside. Within the scope of the present invention, at least one positive fit recess of the spacer element, preferably both positive fit recesses, is designed to fit and accommodate the F-flares of the associated pipe end. The spacer element comprises at least one, preferably two positively fitting recesses at both ends. This positively fitting recess is complementary to the F-flare.

  Within the scope of the present invention, both pipe ends to be joined are provided with F-flares. In the joined state, the F flare at the first pipe end is adjacent to the first positive fit recess of the spacer element. On the other hand, on the opposite side of the spacer element, the F-flare at the second pipe end engages the second positively fitting recess of the spacer element. According to a preferred embodiment, the F-flare / spacer element / F-flare joint is made without cooperating with the other elements.

  According to one embodiment of the invention, the spacer element is inserted into the nut receiving hole in the joined state. In this embodiment, the spacer element is not held in the nut by screw connection, but instead is inserted into the receiving hole of the nut. In the case of this structure, the spacer element is preferably held by at least one knob provided on the surface or inner surface of the receiving hole. The spacer element is preferably inserted into the receiving hole by a knob and is snapped back in place behind the knob. According to a preferred embodiment, several such knobs are distributed around the inner circumference of the receiving hole. Within the scope of the present invention, the nut receiving hole is cylindrical in shape.

  In another preferred embodiment of the invention, the nut receiving hole is provided with a female thread and the spacer element is provided with a male thread complementary to this female thread. According to this embodiment, in the joined state, the spacer element is screwed into the receiving hole of the nut. Therefore, the spacer element is fixed in the accommodation hole of the nut by screw joint.

  Within the scope of the invention, a receiving hole in the nut is provided for receiving the spacer element and for receiving the screw. The screw is screwed by its male screw which is screwed into the female screw of the receiving hole.

  Further, within the scope of the present invention, the nut is provided with a receiving passage having a diameter smaller than the diameter of the receiving hole, and this receiving passage is provided for receiving one (first) pipe end. Accordingly, the (first) pipe end passes through the nut receiving passage. The screw preferably comprises a receiving passage for receiving the other (second) pipe end.

  Within the scope of the present invention, the nut is provided with a stop surface, and in the joined state, this stop surface is engaged from behind with a flare at the (first) pipe end housed in the nut. The stop surface is preferably arranged in the part between the receiving passage and the receiving hole of the nut. Within the scope of the present invention, the screw further has a surface that engages the flare of the (second) pipe end housed in it from behind.

  As already mentioned, within the scope of the present invention, the nut is provided with an inner positive fit element that engages a complementary positive fit element provided in the flare of the pipe end received therein. Complementary positive fit elements may already be provided in the pipe flare or may be formed by interrupting the positive fit element to the nut when screwing. The positive fitting element of the nut is preferably provided on the aforementioned stop surface of the nut.

  Within the scope of the present invention, the spacer element is provided with a surface in at least one positive-fit recess, preferably both positive-fit recesses, this surface being functionally subjected to torque applied by one pipe end. Designed to ensure transmission. The surface of the positive fitting recess is, for example, a profiled surface. In this context, within the scope of the present invention, a positively engaging element is provided which engages a complementary positively engaging element on the flange face of the associated pipe end flare. ing.

  The last described embodiment of the invention effectively suppresses rotation of the pipe ends relative to the spacer elements or relative to each other.

  The invention is based on the recognition that by means of the screw connection device according to the invention, a sealing connection or a sealing connection under high pressure can be achieved simply and economically for a long time. In particular, during the operation of the screw joining device, no disadvantageous damage of the sealing surface occurs. By means of the screw connection device according to the invention, mutual rotation of the pipes to be joined during screwing is prevented. The present invention is based in particular on the important recognition that in this connection it is essential to prevent rotation of the pipe accommodated by the nut relative to the nut. As a result, the pipe or screw joining device can be easily installed, for example, in an automobile. Since pipe rotation relative to the spacer element is avoided, damage to the sealing surface as a result of friction can be prevented. In particular, the friction between the pipe flare on the screw side and the spacer element can be kept relatively high by the appropriate shape of the spacer element. If this friction between the flare on the side of the screw and the spacer element exceeds the friction between the screw and the rear of the flare, the screw is relative to the pipe that is contained in it when the screw connection is made. Rotate to. Thus, the mutual rotation of the two pipes is suppressed and the associated catastrophic movement is prevented.

  Next, the present invention will be described in detail with reference to the drawings showing one embodiment.

  FIG. 1 shows a screw joint or screw joint device according to the state of the art. The ends 1 and 2 of the two pipes to be joined are joined to each other by screw joining using a nut 3 and a screw 4. The ends 1 and 2 of the two pipes are flared. The end 1 of the first pipe has an E-flare 5 and the end 2 of the second pipe has an F-flare 6. As shown, the E-flare 5 has a conical flange surface 5a. Each cone tapers inward, i.e. towards the side of the pipe. The F-flare 6 has a conical flange surface 6a. However, this cone tapers towards the outside, i.e. towards the end face of the end 2 of the pipe. The flare 5, 6 of the two pipes is pressed against each other with a considerably high contact pressure by screwing the nut 3 and the screw 4 together. However, screw connections known from the state of the art have the disadvantages already mentioned.

  2 to 5 show a screw connection or screw connection device according to the invention for joining the flare ends 1, 2 of two pipes. In the present invention, a spacer element 7 is used. This spacer element 7 has a first positive fitting recess (a concave fitting and a fitting concave) 8 at the first end, and a second positive fitting recess 9 at the second end. . Both the first positive fitting recess 8 and the second positive fitting recess 9 are for securely fitting and accommodating the pipe flares 6 of the associated pipe ends 1 and 2. The flare 6 has a conical flange surface outside the pipe. Each cone tapers toward the end face of the pipe ends 1 and 2. Within the scope of the present invention, both the first positive fitting recess 8 and the second positive fitting recess 9 are used to securely fit and accommodate the F-flares 6 of the respective pipe ends 1 and 2. Is provided. Such F-flares 6 are provided at the pipe ends 1 and 2 in the embodiment of FIGS. As can be seen, the spacer element 7 is hollow on the inside, so that liquid supplied through the pipe can pass through this spacer element. The F-flares 6 associated with the positively fitting recesses 8 and 9 have sealing surfaces that press against each other in the joined state. As shown in FIGS. 2 and 4, the nut 3 accommodates the first pipe 1, and in the joined state, the spacer element 7 is inserted into the nut 3, whereby the first pipe end 1 accommodated in the nut 3. The F-flare 6 engages or is pushed into the associated positively fitting recess 8 of the spacer element 7. In the embodiment of FIGS. 2 to 4, the spacer element 7 is only inserted into the receiving hole 10 of the nut 3 in the joined state. In this structure, the spacer element 7 is held in its position by a knob 11 distributed on the inner periphery of the receiving hole 10. Further, the nut 3 is provided with an accommodation passage 12 having a diameter smaller than the diameter of the accommodation hole 10. The first pipe end 1 is fitted and accommodated in the accommodation passage 12.

  A screw 4 is provided for receiving the second pipe end 2. In the joined state, this screw 4 containing the second pipe end 2 is screwed into the nut 3, and the F-flare 6 of the pipe end 2 received by the screw 4 is associated with the positive fitting recess of the spacer element 7. 9 or is pushed into this positively fitting recess. As shown in FIGS. 2 and 4, the accommodation hole 10 of the nut 3 accommodates the spacer element 7 and the screw 4 that accommodates the second pipe end 2.

  As shown in FIGS. 2, 4, and 5, the nut 3 includes a stop surface 13 in a portion between the accommodation passage 12 and the accommodation hole 10. This stop surface 13 engages behind the F-flare 6 of the first pipe end 1 housed in the housing passage 12 of the nut 3. In the region of the stop surface 13, the nut 3 is provided with a positively fitting element (an element that can be positively fitted, an engaging element) in the form of a notch 14 arranged inside. In the illustrated embodiment, the notch 14 has a V-shaped cross section. The notch may have a U-shaped cross section, for example. As in the illustrated embodiment, it is advantageous if the notches 14 are arranged or oriented radially with respect to the longitudinal axis of the nut 3. In the joined state, a complementary (complementary) positive mating element engages this notch 14. This complementary positive mating element is arranged on the back of the F-flare of the first pipe end 1. This complementary positive mating element of the F-flare of the first pipe end 1 is preferably in the form of a projection 15 that can engage the notch 14 of the nut 3 to ensure a positive fit. ing. Within the scope of the invention, a positively fitting element is provided only on the nut 3 according to an embodiment not shown in the figures. As a result of the pressure only during the screw connection state and during the relative pressing of the elements, this positively-fitting element of the nut 3 corresponds to the pipe flare of the first pipe end 1 in a corresponding complementary manner. Produces a positive mating element. Thus, this complementary positive-fit element only occurs when the screws are joined and the elements are pressed together. The positive-fit element complementary to the positive-fit element is designed such that the first pipe end 1 accommodated in the nut is fixed without rotating relative to the nut 3. Furthermore, the screw 4 is provided with a surface 16 which engages the back of the F-flare of the second pipe end 2 housed therein.

It is a perspective view of the screw joint part by a technical level. It is a longitudinal cross-sectional view of the screw joint part by this invention. FIG. 3 is a cross-sectional view of the screw joint portion of FIG. 2. It is a perspective view of the screw joint part by this invention. It is a perspective view of a nut.

Explanation of symbols

1, 2 Pipe end 3 Nut 4 Screw 6 F-flare 7 Spacer element 8, 9 Reliable fitting recess 10 Receiving hole 12 Receiving passage 13 End face 16

Claims (12)

In the screw joining device for joining the flare ends (1, 2) of two pipes,
A spacer element (7) is provided, the spacer element having a first positive fitting recess (1) for fitting and accommodating a flare of the end (1, 2) of the first pipe at the first end. 8), and a second positive fitting recess (9) for fitting and accommodating the flare of the end (1, 2) of the other pipe at the second end,
Furthermore, a nut (3) for accommodating one pipe end (1, 2) is provided, and in the joined state, the flare of the pipe end (1, 2) received by the nut (3) is a spacer element. The spacer element (7) is inserted into the nut (3) so as to engage the associated positively fitting recess (8, 9) of (7),
Furthermore, a screw (4) for joining another pipe end (1, 2) is provided, and in the joined state, the flare of the pipe end (1, 2) received by the screw (4) is a spacer element. The associated pipe end (1, 2) of the screw (4) is screwed into the nut (3) so as to engage the associated positively fitting recess (8, 9) of (7),
The nut (3) and the pipe flare of the pipe end (1, 2) housed in the nut (3) in the joined state comprise a positively fitting element, the associated pipe end (1, 2) being the nut (3) The screw joint device, wherein the positive fitting element is designed to be fixed so as not to rotate relative to (3).   The nut (3) has a positive fitting element on the inside, and the pipe flare of the pipe end (1, 2) accommodated in the nut (3) in the joined state has a complementary positive fitting element in the joined state. 2. The screw connection device according to claim 1, wherein the inner positive-fit element is engaged with a complementary positive-fit element.   The nut (3) has an inner positively fitting element, and when this positively fitting element achieves threaded connection, the pipe flare of the pipe end (1, 2) accommodated in the nut (3) in the connected state 2. The screw connection device according to claim 1, wherein the inner positive mating element is designed to interrupt and thereby form a complementary positive mating element in the pipe flare.   At least one positively fitting recess (8, 9) of the spacer element (7), preferably both positively fitting recesses (8, 9), flares (6) of the associated pipe end (1, 2). Designed to fit and receive, the flare (6) is provided with a conical flange surface on the outside of the pipe and the associated cone is tapered towards the end face of the pipe end (1, 2) The screw joining device according to any one of claims 1 to 3, wherein the screw joining device is provided.   At least one positively fitting recess (8,9) of the spacer element (7), preferably both positively fitting recesses (8,9), are connected to the F-flare (6) of the associated pipe end (1,2). The screw joining device according to any one of claims 1 to 4, wherein the screw joining device is designed to be fitted and received.   6. The screw joining device according to claim 1, wherein the spacer element (7) is inserted into the receiving hole (10) of the nut (3) in the joined state.   The receiving hole (10) of the nut (3) is provided with a female screw, the spacer element (7) is provided with a male screw complementary to this female screw, and in the joined state, the spacer element (7) is in the receiving hole (10). The screw joining device according to any one of claims 1 to 5, wherein the screw joining device is screwed.   8. A receiving hole (10) in the nut (3) is provided for receiving the spacer element (7) and for receiving the screw (4). The screw joining apparatus described in 1.   The nut (3) is provided with an accommodation passage (12) having a diameter smaller than the diameter of the accommodation hole (10), and this accommodation passage (12) is provided for accommodating one pipe end (1, 2). The screw joining device according to any one of claims 1 to 8, wherein the screw joining device is provided.   The nut (3) is provided with a stop surface (13), and in a joined state, the stop surface (13) is engaged from behind with the flare of the pipe end (1, 2) accommodated in the nut (3). The screw joining apparatus according to any one of claims 1 to 9, wherein   A screw (4) according to any one of the preceding claims, characterized in that it comprises a surface (16) that engages from behind the flare of the pipe end (1, 2) accommodated therein. The screw joining apparatus as described.   The spacer element (7) is provided with a face in at least one positively fitting recess (8, 9), which provides a functionally safe transmission of the torque applied by one pipe end (1, 2). The screw joining device according to claim 1, wherein the screw joining device is designed as described above.

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